forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.5 KiB
65 lines
1.5 KiB
/* |
|
* Copyright (C) 2004 - 2007 Paul Mundt |
|
* |
|
* This file is subject to the terms and conditions of the GNU General Public |
|
* License. See the file "COPYING" in the main directory of this archive |
|
* for more details. |
|
*/ |
|
#include <linux/mm.h> |
|
#include <linux/init.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/dma-mapping.h> |
|
#include <linux/io.h> |
|
|
|
static int __init memchunk_setup(char *str) |
|
{ |
|
return 1; /* accept anything that begins with "memchunk." */ |
|
} |
|
__setup("memchunk.", memchunk_setup); |
|
|
|
static void __init memchunk_cmdline_override(char *name, unsigned long *sizep) |
|
{ |
|
char *p = boot_command_line; |
|
int k = strlen(name); |
|
|
|
while ((p = strstr(p, "memchunk."))) { |
|
p += 9; /* strlen("memchunk.") */ |
|
if (!strncmp(name, p, k) && p[k] == '=') { |
|
p += k + 1; |
|
*sizep = memparse(p, NULL); |
|
pr_info("%s: forcing memory chunk size to 0x%08lx\n", |
|
name, *sizep); |
|
break; |
|
} |
|
} |
|
} |
|
|
|
int __init platform_resource_setup_memory(struct platform_device *pdev, |
|
char *name, unsigned long memsize) |
|
{ |
|
struct resource *r; |
|
dma_addr_t dma_handle; |
|
void *buf; |
|
|
|
r = pdev->resource + pdev->num_resources - 1; |
|
if (r->flags) { |
|
pr_warn("%s: unable to find empty space for resource\n", name); |
|
return -EINVAL; |
|
} |
|
|
|
memchunk_cmdline_override(name, &memsize); |
|
if (!memsize) |
|
return 0; |
|
|
|
buf = dma_alloc_coherent(&pdev->dev, memsize, &dma_handle, GFP_KERNEL); |
|
if (!buf) { |
|
pr_warn("%s: unable to allocate memory\n", name); |
|
return -ENOMEM; |
|
} |
|
|
|
r->flags = IORESOURCE_MEM; |
|
r->start = dma_handle; |
|
r->end = r->start + memsize - 1; |
|
r->name = name; |
|
return 0; |
|
}
|
|
|